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How to Find and Shut Off Your Main Water Valve

In a plumbing emergency, knowing where to turn off the water is the most useful thing you can know.

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Where to look

Where the water line enters the house: a basement, crawl space, utility room, or near the water heater.

Diagram: The two common kinds of main water shut-off valve.
Diagram: The two common kinds of main water shut-off valve.

Test it

Turn it off and on once a year so it does not seize. If it is stiff or leaks, have a plumber replace it.

Small shut-offs

Most sinks and toilets have their own small valves underneath. Use these for a single-fixture leak.

Label it

Hang a tag on the main valve so everyone in the home can find it.

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